There are 12 zip codes in Whiteside County, Illinois. The most populated is 61081, located in Sterling. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
6108121,138Sterling
6107113,766Rock Falls
612707,096Morrison
612525,424Fulton
612772,978Prophetstown
612502,713Erie
612831,422Tampico
61230932Albany
61261644Lyndon
61251382Fenton
61243277Deer Grove
61037105Galt

Zip Codes in Whiteside County, Illinois by Population (2024)